As a Tesla owner of 5 years with a cross country road trip in the car, Teslas charging has never failed me. It’s rare to encounter a charging stall not working, but every location has multiple chargers and they repair stalls quickly.
Almost every location I’ve been to has at least 8 stalls if not more. The navigation in the car also keeps track of stalls in use, electricity prices, expected wait time and if any stalls are not working.
Oolimo, the website and phone app is a great resource for me. It lets you enter notes on a fretboard to identify chords.